The below advice, from Mack Boring, is for the Yanmar 3GM30F, but is essentially the same procedure for most engines: "Coolant Change – Yanmar 3GM30FC (Japan, circa 1999)Coolant Change – Yanmar 3GM30FC (Japan, circa 1999) Background: Yanmar accepts the following antifreeze applications in their products, present and past models: Ethylene glycol-Changed annually regardless of hours of operation. Extended Life Antifreeze…
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